<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    function Person(){

    }

    //prototype 是讲构造函数
    Person.prototype.say = function(){
        alert('aa')
    }

    var p = new Person();
    //p .__proto__

    console.log(p.__proto__ === Person.prototype);

    console.log(p.__proto__.__proto__ == Person.prototype.__proto__)


</script>
</body>
</html>